Circle badge and removed app.json

app.json

@@ -1,63 +0,0 @@
-{
-  "name": "outline",
-  "scripts": {
-    "postdeploy": "yarn build && yarn sequelize:migrate"
-  },
-  "env": {
-    "AWS_ACCESS_KEY_ID": {
-      "required": true
-    },
-    "AWS_S3_UPLOAD_BUCKET_NAME": {
-      "required": true
-    },
-    "AWS_S3_UPLOAD_BUCKET_URL": {
-      "required": true
-    },
-    "AWS_S3_UPLOAD_MAX_SIZE": {
-      "required": true
-    },
-    "AWS_SECRET_ACCESS_KEY": {
-      "required": true
-    },
-    "BUGSNAG_KEY": {
-      "required": true
-    },
-    "NODE_MODULES_CACHE": {
-      "required": true
-    },
-    "REDIS_URL": {
-      "required": true
-    },
-    "SECRET_KEY": {
-      "required": true
-    },
-    "SLACK_KEY": {
-      "required": true
-    },
-    "SLACK_REDIRECT_URI": {
-      "required": true
-    },
-    "SLACK_SECRET": {
-      "required": true
-    },
-    "SLACK_VERIFICATION_TOKEN": {
-      "required": true
-    },
-    "URL": {
-      "required": true
-    },
-    "BUGSNAG_KEY": {
-      "required": true
-    }
-  },
-  "formation": {},
-  "addons": [
-    "heroku-postgresql",
-    "heroku-redis"
-  ],
-  "buildpacks": [
-    {
-      "url": "heroku/nodejs"
-    }
-  ]
-}